Photos of Baek Ji Young and B2ST's Junhyung celebrating their first performance of "Good Boy" were released on the 17th.

WS Entertainment shared on their official Twitter, "Baek Ji Young with Junhyung on their first 'M! Countdown' stage," along with a few photos.

Fans commented, "Your performance yesterday was the best," "Every stage should be like this," and "I'm looking forward to your sexy performances."

Baek Ji Young made a successful comeback after three years with her new mini-album, 'Good Boy', and finished her first comeback stage on the 17th. B2ST's Junhyung also made an appearance, which made for an exciting performance.

Source + Image: WS Entertainment's Twitter, Newsen via Nate